h1. Heading 1

h2. Heading 2

h3. Heading 3

h4. Heading 4

h5. Heading 5

h6. Heading 6

Body Copy

Bootstrap's global default font-size is 15px, with a line-height of 22px. This is applied to the <body>and all paragraphs. In addition, <p> (paragraphs) receive a bottom margin of half their line-height (11px by default).

Example:

and in HTML5. is meant to highlight words or phrases without conveying additional importance while is mostly for voice, technical terms, etc.